Ahlfeldite Mineral Data (original) (raw)

General Ahlfeldite Information

Help on Chemical Formula: Chemical Formula:

(Ni,Co)SeO3•2(H2O)

Help on Composition: Composition:

Molecular Weight = 221.74 gm

Cobalt 6.64 % Co 8.45 % CoO

Nickel 19.85 % Ni 25.26 % NiO

Hydrogen 1.82 % H 16.25 % H2O

Selenium 35.61 % Se 50.04 % SeO2

Oxygen 36.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ni0.75Co0.25(SeO3)•2(H2O)

Help on Environment: Environment:

Formed as an alteration product of penroseeite and other selenides.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1935

Help on Locality: Locality:

Bolivia, Potos�, Colquechaca Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Federico Ahlfeld (1892-192), German-Bolivian geologist and mineralogist who studied Bolivian minerals.

Help on Name Pronunciation: Name Pronunciation:

Ahlfeldite + Pronunciation Say AHLFELDITE

Help on Synonym: Synonym:

ICSD 69220

PDF 25-1233

Ahlfeldite Image

Click Here for Larger Ahlfeldite Image in a New Browser Window Images:

Ahlfeldite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.8595:1:0.734

Help on Cell Dimensions: Cell Dimensions:

a = 7.53, b = 8.76, c = 6.43, Z = 4; beta = 99.083° V = 418.82 Den(Calc)= 3.52

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 5.69(1), 3.426(0.8), 2.992(0.75),

Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
- Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

| | Forms:( 0 2 1) ( 1 1 0) ( 1 0 3) ( 1 0 1) ( 0 1 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Ahlfeldite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

| | Wildner M , Neues Jahrbuch fur Mineralogie, Monatshefte , 1990 (1990) p.353-362, Crystal structure refinements of synthetic cobaltomenite (CoSeO3*2H2O), and ahlfeldite (NiSeO3*2H2O) | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Physical Properties of Ahlfeldite

Help on Cleavage: Cleavage:

{110} Distinct, {103} Distinct

Help on Color: Color:

Pink brown, Apple green, Red.

Help on Density: Density:

3.37

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Help on Habit: Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Help on Hardness: Hardness:

2-2.5 - Gypsum-Finger Nail

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

light green

Optical Properties of Ahlfeldite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2115,KPDmeas= 0.2209,KC= 0.2124
Ncalc = 1.72 - 1.75

Help on Optical Data: Optical Data:

Biaxial (-), a=1.703, b=1.744, g=1.786, bire=0.0830, 2V(Calc)=88, 2V(Meas)=85. Dispersion r < v.

Help on Pleochroism (x): Pleochroism (x):

very pale green.

Help on Pleochroism (y): Pleochroism (y):

pale green.

Help on Pleochroism (z): Pleochroism (z):

green.

Calculated Properties of Ahlfeldite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Ahlfeldite =3.52 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Help on Photoelectric: Photoelectric:

PEAhlfeldite = 36.69 barns/electron
U=PEAhlfeldite x rElectron Density= 123.20 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ahlfeldite is Not Radioactive

Ahlfeldite Classification

Help on Dana Class: Dana Class:

34.02.03.03 (34)Selenites - Tellurites - Sulfites

(34.02)as A++ XO3 � x(H2O)

(34.02.03)Chalcomenite Group (Monoclinic)

34.02.03.01 Clinochalcomenite CuSeO3•2(H2O) P 21/n 2/m

34.02.03.02 Cobaltomenite CoSeO3•2(H2O) P 21/n 2/m

34.02.03.03 Ahlfeldite (Ni,Co)SeO3•2(H2O) P 21/m 2/m

Help on Strunz Class: Strunz Class:

04.JH.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JH -Selenites without additional anions, with H2O

04.JH.10 Ahlfeldite (Ni,Co)SeO3•2(H2O) P 21/m 2/m

04.JH.10 Clinochalcomenite CuSeO3•2(H2O) P 21/n 2/m

04.JH.10 Cobaltomenite CoSeO3•2(H2O) P 21/n 2/m

Other Ahlfeldite Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

Help on See Also: See Also:

Links to other databases for Ahlfeldite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Ahlfeldite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ahlfeldite :

A Bijoux Google Search for Ahlfeldite
Adam's Minerals Google Search for Ahlfeldite
Cape Minerals Google Search for Ahlfeldite
Dakota Matrix Minerals Google Search for Ahlfeldite
Excalibur Mineral Corp. Google Search for Ahlfeldite
Exceptional Minerals Google Search for Ahlfeldite
John Betts Fine Minerals Search for Ahlfeldite
McDougall Minerals Google Search for Ahlfeldite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ahlfeldite
Weinrich Minerals, Inc. Google Search for Ahlfeldite

Ask about Ahlfeldite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

Print or Cut-and-Paste your Ahlfeldite Specimen Label here :

Ahlfeldite

(Ni,Co)SeO3•2(H2O)
Dana No: 34.02.03.03 Strunz No: 04.JH.10
Locality:

Notes: